IPv6 – MAC | Link layer Address Mapping | NDP NS NA Basics
IPv6 is given but how to find out the MAC address or the Link-layer Address. IPv4 does this by ARP.
IPv6 does it by Neighbor Discovery Protocol (NDP). NDP maps an IPv6 address to MAC address on the same LAN. NDP uses ICMPv6 messages:
Neighbor Solicitation (ICMPv6 Type =135): The NS message is sent using solicited-node multicast address. Only host with matching last six hex digits will process the request.
In response to NS, Neighbor Advertisement (NA) (ICMPv6 Type =136) message is sent by the intended destination. NA is sent to unicast address of sending host.
The NA can be send to unicast address of the sending client or it can be sent using Multicast address FF02::1 which means To ALL IPv6 hosts.
#IPv6
#NDP
#NeighborDiscoveryProtocol .